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post #1 of 4 (permalink) Old 05-07-2008, 04:08 PM Thread Starter
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One of the three rooftop HVAC units on our one story industrial building had reached the end of its useful life. It's 23-25 years old, so I guess we got our money's worth on the old Snyder General battleaxe.

Our HVAC contractor has quoted three possibilities as replacements for this 3 ton unit. Now the units are all high efficiency. The regulatory threshold we apparently are approaching is one regulating the type of refrigerant that can be used in these units. The choices are R22, which is being phased out over the next years, and the new 410a high pressure refrigerant. Now I can purchase units with either refrigerant, and R22 should be available for servicing existing units for many years.

My questions are:

What should I be considering as I weigh my choice between units designed for use with each of these refrigerants (besides cost--the R22 units are a bit cheaper now)?

The brands quoted to me are Carrier and Trane. We have other Carrier and Trane HVAC units on our roof now. The distributors for parts for both of these manufacturers are located relatively close geographically. The distributors for parts for some of the other brands are located a goodly drive across the metro area from where we are located. Therefore, future service costs would be affected by travel time on other brands. So, what are the issues regarding Carrier vs. Trane in a commercial grade unit?

Thanks in advance for your knowledgeable help and advice.

Keytickler

"Time flies like an arrow, but fruit flies like a banana." -Groucho Marx
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post #2 of 4 (permalink) Old 05-07-2008, 04:38 PM
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R-22 will be phased out first. 2020 i believe. that date is always changing. you will be able to get R-22 for many years to come. like anything you will have to pay a bit extra for it. being that it is only 3 tons there is not a lot of R-22 in the machine to begin with so refrigerant replacement should not be that large of a concern.
make sure that your new unit, carrier or trane has a good factory warrany on the compressor. that would go out first.

what is this unit serving? is it running 24/7? i would get the most efficient unit that you can. when you say roof top unit do you mean an air handler or just the condensing unit like you see at your house outside.

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Last edited by HeavyHand; 05-07-2008 at 04:54 PM.
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post #3 of 4 (permalink) Old 05-07-2008, 04:46 PM
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Get the R-22, they will have replacements for r-22 in the future.




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post #4 of 4 (permalink) Old 05-08-2008, 02:18 PM Thread Starter
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Originally Posted by HeavyHand View Post
R-22 will be phased out first. 2020 i believe. that date is always changing. you will be able to get R-22 for many years to come. like anything you will have to pay a bit extra for it. being that it is only 3 tons there is not a lot of R-22 in the machine to begin with so refrigerant replacement should not be that large of a concern.
make sure that your new unit, carrier or trane has a good factory warrany on the compressor. that would go out first.

what is this unit serving? is it running 24/7? i would get the most efficient unit that you can. when you say roof top unit do you mean an air handler or just the condensing unit like you see at your house outside.
It's a complete HVAC unit--providing heat and A/C to the front office area of our building. It's not running 24/7--we're a one shift M-F operation. There's a clock thermostat on this unit adjusting the office temp for different hours and days.

Keytickler

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